Who called from 4159974094

NO MESSAGE, JUST SHOWED AS UNKNOWN IN MY CALLER ID.

No message. Caller ID says "Unknown Name". Only rang 3 times then hung up.

No Message, caller Unknown.

Shows Nicasio, CA Hung up.

I got a call from 415-9987-4094  I answered no one was there.  I called back there was music and then I called again and
the person said they were from the breast cancer survivor organization and wanted to see if I wanted to make a donation.
Be careful  not sure this is a legitimate number.